Abstract
Determination of appropriate row spacing and phosphorus rate of mung bean can increase its productivity. Therefore, a field experiment was conducted at Fedis Agricultural Research Center during main growing season to evaluate the effect of phosphorus rate and row spacing on yield and yield related traits of mung bean. Factorial combinations of four phosphorus rate (0, 23, 46, 69 kg P<sub>2</sub>O<sub>5</sub> ha<sup>-1</sup>) and three row spacing (20, 30, and 40 cm) laid out in RCBD with three replications. A total of 12 treatments and Borda variety was used for the experiment. The results revealed that there were significant (P<0.05) differences for plant height, total and effective number of nodule plant<sup>-1</sup>, pod plant<sup>-1</sup>, thousand grain weight, dry biomass yield and grain yield due to phosphorus application. Branch per plant, pod per plant, pod length and dry biomass yield were significantly (P<0.05) affected due to row spacing. The highest Thousand Grain Weight (30.18 g) was obtained from the application of 46 kg P<sub>2</sub>O<sub>5</sub> ha<sup>-1</sup> while the lowest (28.27 g) was obtained from 0 kg P<sub>2</sub>O<sub>5</sub> ha<sup>-1</sup>. The highest grain yield (961.6 kg ha<sup>-1</sup>) was achieved from 46 kg P<sub>2</sub>O<sub>5</sub> ha<sup>-1</sup> while the lowest (766.7 kg ha<sup>-1</sup>) was from 0 P<sub>2</sub>O<sub>5</sub>. In conclusion, the application of 46 kg P<sub>2</sub>O<sub>5</sub> ha<sup>-1</sup> and 30 cm row spacing recorded highest grain yield with highest economic returns (14123.78 ETB ha<sup>-1</sup>). Based on grain yield and economic return, combination of 46 kg P<sub>2</sub>O<sub>5</sub> ha<sup>-1</sup> and 30 cm row spacing was recommended for the study area and similar agro-ecology.
Highlights
Mung bean (Vigna radiata L.) known as Green gram is a self-pollinated leguminous crop and is among the most important pulse crops of the world
The treatments consisted of factorial combination of four fertilizer rate (0, 23, 46 and 69 kg ha-1 of P2O5) as triple super phosphate (TSP) and three row spacing (20, 30 and 40cm)
The experiment was conducted to determine the effect of row spacing and phosphorus fertilizer rate on mung bean yield and yield parameters
Summary
Mung bean (Vigna radiata L.) known as Green gram is a self-pollinated leguminous crop and is among the most important pulse crops of the world. It has great value as food, fodder and green manure. This crop can be successfully grown on marginal lands where other crops perform poorly [7]. Optimum row spacing plays an important role in contributing to the high yield because thick plant population will not get proper light for photosynthesis and can be attacked by diseases. Optimum plant spacing and seed rate should be ensured for the plant to grow properly in order to give higher yield [15]
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